React Native Guides Digital signatures

Digital Signatures

Digital signatures verify signer identity and document integrity after signing. Starting with 3.2.0, ComPDF React Native SDK supports PKCS#12 certificate management, signature-field signing, signature reading and verification, timestamps, and long-term validation material.

Digital signatures differ from handwritten or image signatures: an appearance image provides a visual representation, while a digital signature uses certificates and digests to verify content. Assess signature validity, document changes, certificate trust, and certificate expiry separately. A visible signature alone does not establish validity.

Key Features

• Generate and read PKCS#12 certificates, check passwords, and add trusted certificates.
• Sign unsigned signature fields with certificates and configure appearance and modification permissions.
• Read signer, certificate, and field information, and verify signatures and timestamps.
• Add long-term validation material to saved signed files and optionally append a document timestamp.

Guides

• Certificate Management: Prepare signing certificates and trust material.
• Create Digital Signatures: Find a signature field and output a signed copy.
• Read and Verify Digital Signatures: Read signature information and interpret verification results.
• Timestamps and Long-Term Validation: Configure timestamp services, inspect validation material, and add missing material.

Follow this sequence: prepare a certificate, sign and save a copy, open the copy for verification, then add long-term validation material.